#include <tls_extensions.h>

Public Member Functions
void	add (Extension *extn)
void	add (std::unique_ptr< Extension > extn)
const std::vector< std::unique_ptr< Extension > > &	all () const
bool	contains_implemented_extensions_other_than (const std::set< Extension_Code > &allowed_extensions) const
bool	contains_other_than (const std::set< Extension_Code > &allowed_extensions, bool allow_unknown_extensions=false) const
void	deserialize (TLS_Data_Reader &reader, Connection_Side from, Handshake_Type message_type)
bool	empty () const
std::set< Extension_Code >	extension_types () const
	Extensions ()=default
	Extensions (const Extensions &)=delete
	Extensions (Extensions &&)=default
	Extensions (TLS_Data_Reader &reader, Connection_Side side, Handshake_Type message_type)
template<typename T>
T *	get () const
Extension *	get (Extension_Code type) const
template<typename T>
bool	has () const
bool	has (Extension_Code type) const
Extensions &	operator= (const Extensions &)=delete
Extensions &	operator= (Extensions &&)=default
bool	remove_extension (Extension_Code type)
std::vector< uint8_t >	serialize (Connection_Side whoami) const
size_t	size () const
template<typename T>
decltype(auto)	take ()
std::unique_ptr< Extension >	take (Extension_Code type)
	~Extensions ()

Detailed Description

Represents a block of extensions in a hello message

Definition at line 907 of file tls_extensions.h.

Constructor & Destructor Documentation

◆ Extensions() [1/4]

Botan::TLS::Extensions::Extensions ( )

default

Referenced by Extensions(), Extensions(), operator=(), and operator=().

◆ Extensions() [2/4]

Botan::TLS::Extensions::Extensions ( const Extensions & )

delete

References Extensions().

◆ Extensions() [3/4]

Botan::TLS::Extensions::Extensions ( Extensions && )

default

References Extensions().

◆ ~Extensions()

Botan::TLS::Extensions::~Extensions ( )

default

◆ Extensions() [4/4]

Botan::TLS::Extensions::Extensions	(	TLS_Data_Reader &	reader,
		Connection_Side	side,
		Handshake_Type	message_type )

inline

Definition at line 996 of file tls_extensions.h.

                                                                                             {
         deserialize(reader, side, message_type);
      }

References deserialize().

Member Function Documentation

◆ add() [1/2]

void Botan::TLS::Extensions::add ( Extension * extn )

inline

Definition at line 931 of file tls_extensions.h.

931{ add(std::unique_ptr<Extension>(extn)); }

Botan::TLS::Extensions::add

void add(std::unique_ptr< Extension > extn)

Definition tls_extensions.cpp:121

References add().

Referenced by add().

◆ add() [2/2]

void Botan::TLS::Extensions::add ( std::unique_ptr< Extension > extn )

Definition at line 121 of file tls_extensions.cpp.

                                                  {
   if(has(extn->type())) {
      throw Invalid_Argument("cannot add the same extension twice: " +
                             std::to_string(static_cast<uint16_t>(extn->type())));
   }
 
   m_extensions.emplace_back(extn.release());
}

References has().

Referenced by deserialize().

◆ all()

const std::vector< std::unique_ptr< Extension > > & Botan::TLS::Extensions::all ( ) const

inline

Definition at line 911 of file tls_extensions.h.

911{ return m_extensions; }

◆ contains_implemented_extensions_other_than()

bool Botan::TLS::Extensions::contains_implemented_extensions_other_than ( const std::set< Extension_Code > & allowed_extensions ) const

inline

Parameters

allowed_extensions extension types that are allowed

Returns: true if this contains any extensions implemented by Botan that are not contained in allowed_extensions.

Definition at line 952 of file tls_extensions.h.

                                                                                                              {
         return contains_other_than(allowed_extensions, true);
      }

References contains_other_than().

◆ contains_other_than()

bool Botan::TLS::Extensions::contains_other_than	(	const std::set< Extension_Code > &	allowed_extensions,
		bool	allow_unknown_extensions = false ) const

Parameters

allowed_extensions	extension types that are allowed
allow_unknown_extensions	if true, ignores unrecognized extensions

Returns: true if this contains any extensions that are not contained in allowed_extensions.

Definition at line 158 of file tls_extensions.cpp.

                                                                                {
   const auto found = extension_types();
 
   std::vector<Extension_Code> diff;
   std::set_difference(
      found.cbegin(), found.end(), allowed_extensions.cbegin(), allowed_extensions.cend(), std::back_inserter(diff));
 
   if(allow_unknown_extensions) {
      // Go through the found unexpected extensions whether any of those
      // is known to this TLS implementation.
      const auto itr = std::find_if(diff.cbegin(), diff.cend(), [this](const auto ext_type) {
         const auto ext = get(ext_type);
         return ext && ext->is_implemented();
      });
 
      // ... if yes, `contains_other_than` is true
      return itr != diff.cend();
   }
 
   return !diff.empty();
}

References extension_types().

Referenced by contains_implemented_extensions_other_than().

◆ deserialize()

void Botan::TLS::Extensions::deserialize	(	TLS_Data_Reader &	reader,
		Connection_Side	from,
		Handshake_Type	message_type )

Definition at line 130 of file tls_extensions.cpp.

                                                                                                                   {
   if(reader.has_remaining()) {
      const uint16_t all_extn_size = reader.get_uint16_t();
 
      if(reader.remaining_bytes() != all_extn_size) {
         throw Decoding_Error("Bad extension size");
      }
 
      while(reader.has_remaining()) {
         const uint16_t extension_code = reader.get_uint16_t();
         const uint16_t extension_size = reader.get_uint16_t();
 
         const auto type = static_cast<Extension_Code>(extension_code);
 
         if(this->has(type)) {
            throw TLS_Exception(TLS::Alert::DecodeError, "Peer sent duplicated extensions");
         }
 
         // TODO offer a function on reader that returns a byte range as a reference
         // to avoid this copy of the extension data
         const std::vector<uint8_t> extn_data = reader.get_fixed<uint8_t>(extension_size);
         TLS_Data_Reader extn_reader("Extension", extn_data);
         this->add(make_extension(extn_reader, type, from, message_type));
         extn_reader.assert_done();
      }
   }
}

References add(), Botan::TLS::TLS_Data_Reader::get_fixed(), Botan::TLS::TLS_Data_Reader::get_uint16_t(), has(), Botan::TLS::TLS_Data_Reader::has_remaining(), and Botan::TLS::TLS_Data_Reader::remaining_bytes().

Referenced by Extensions().

◆ empty()

bool Botan::TLS::Extensions::empty ( ) const

inline

Definition at line 927 of file tls_extensions.h.

927{ return m_extensions.empty(); }

◆ extension_types()

std::set< Extension_Code > Botan::TLS::Extensions::extension_types ( ) const

Definition at line 228 of file tls_extensions.cpp.

                                                         {
   std::set<Extension_Code> offers;
   std::transform(
      m_extensions.cbegin(), m_extensions.cend(), std::inserter(offers, offers.begin()), [](const auto& ext) {
         return ext->type();
      });
   return offers;
}

Referenced by contains_other_than().

◆ get() [1/2]

template<typename T>

T * Botan::TLS::Extensions::get ( ) const

inline

Definition at line 914 of file tls_extensions.h.

                     {
         return dynamic_cast<T*>(get(T::static_type()));
      }

References get().

Referenced by Botan::TLS::Certificate_13::Certificate_13(), Botan::TLS::Certificate_13::Certificate_13(), get(), has(), has(), Botan::TLS::Hello_Retry_Request::Hello_Retry_Request(), Botan::TLS::Client_Hello_13::retry(), and Botan::TLS::Client_Hello_13::validate_updates().

◆ get() [2/2]

Extension * Botan::TLS::Extensions::get ( Extension_Code type ) const

Definition at line 114 of file tls_extensions.cpp.

                                                    {
   const auto i =
      std::find_if(m_extensions.cbegin(), m_extensions.cend(), [type](const auto& ext) { return ext->type() == type; });
 
   return (i != m_extensions.end()) ? i->get() : nullptr;
}

◆ has() [1/2]

template<typename T>

bool Botan::TLS::Extensions::has ( ) const

inline

Definition at line 919 of file tls_extensions.h.

                       {
         return get<T>() != nullptr;
      }

References get().

Referenced by add(), Botan::TLS::Certificate_13::Certificate_13(), deserialize(), Botan::TLS::Hello_Retry_Request::Hello_Retry_Request(), Botan::TLS::Client_Hello_13::retry(), and Botan::TLS::Client_Hello_13::validate_updates().

◆ has() [2/2]

bool Botan::TLS::Extensions::has ( Extension_Code type ) const

inline

Definition at line 923 of file tls_extensions.h.

923{ return get(type) != nullptr; }

References get().

◆ operator=() [1/2]

Extensions & Botan::TLS::Extensions::operator= ( const Extensions & )

delete

References Extensions().

◆ operator=() [2/2]

Extensions & Botan::TLS::Extensions::operator= ( Extensions && )

default

References Extensions().

◆ remove_extension()

bool Botan::TLS::Extensions::remove_extension ( Extension_Code type )

inline

Remove an extension from this extensions object, if it exists. Returns true if the extension existed (and thus is now removed), otherwise false (the extension wasn't set in the first place).

Note: not used internally, might be used in Callbacks::tls_modify_extensions()

Definition at line 987 of file tls_extensions.h.

987{ return take(type) != nullptr; }

Botan::TLS::Extensions::take

decltype(auto) take()

Definition tls_extensions.h:961

References take().

◆ serialize()

std::vector< uint8_t > Botan::TLS::Extensions::serialize ( Connection_Side whoami ) const

Definition at line 194 of file tls_extensions.cpp.

                                                                     {
   std::vector<uint8_t> buf(2);  // 2 bytes for length field
 
   for(const auto& extn : m_extensions) {
      if(extn->empty()) {
         continue;
      }
 
      const uint16_t extn_code = static_cast<uint16_t>(extn->type());
 
      const std::vector<uint8_t> extn_val = extn->serialize(whoami);
 
      buf.push_back(get_byte<0>(extn_code));
      buf.push_back(get_byte<1>(extn_code));
 
      buf.push_back(get_byte<0>(static_cast<uint16_t>(extn_val.size())));
      buf.push_back(get_byte<1>(static_cast<uint16_t>(extn_val.size())));
 
      buf += extn_val;
   }
 
   const uint16_t extn_size = static_cast<uint16_t>(buf.size() - 2);
 
   buf[0] = get_byte<0>(extn_size);
   buf[1] = get_byte<1>(extn_size);
 
   // avoid sending a completely empty extensions block
   if(buf.size() == 2) {
      return std::vector<uint8_t>();
   }
 
   return buf;
}

References Botan::get_byte().

◆ size()

size_t Botan::TLS::Extensions::size ( ) const

inline

Definition at line 925 of file tls_extensions.h.

925{ return m_extensions.size(); }

◆ take() [1/2]

template<typename T>

decltype(auto) Botan::TLS::Extensions::take ( )

inline

Take the extension with the given type out of the extensions list. Returns a nullptr if the extension didn't exist.

Definition at line 961 of file tls_extensions.h.

                            {
         std::unique_ptr<T> out_ptr;
 
         auto ext = take(T::static_type());
         if(ext != nullptr) {
            out_ptr.reset(dynamic_cast<T*>(ext.get()));
            BOTAN_ASSERT_NOMSG(out_ptr != nullptr);
            ext.release();
         }
 
         return out_ptr;
      }

References BOTAN_ASSERT_NOMSG, Botan::out_ptr(), and take().

Referenced by remove_extension(), and take().

◆ take() [2/2]

std::unique_ptr< Extension > Botan::TLS::Extensions::take ( Extension_Code type )

Take the extension with the given type out of the extensions list. Returns a nullptr if the extension didn't exist.

Definition at line 181 of file tls_extensions.cpp.

                                                             {
   const auto i =
      std::find_if(m_extensions.begin(), m_extensions.end(), [type](const auto& ext) { return ext->type() == type; });
 
   std::unique_ptr<Extension> result;
   if(i != m_extensions.end()) {
      std::swap(result, *i);
      m_extensions.erase(i);
   }
 
   return result;
}

The documentation for this class was generated from the following files:

src/lib/tls/tls_extensions.h
src/lib/tls/tls_extensions.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ Extensions() [1/4]

◆ Extensions() [2/4]

◆ Extensions() [3/4]

◆ ~Extensions()

◆ Extensions() [4/4]

Member Function Documentation

◆ add() [1/2]

◆ add() [2/2]

◆ all()

◆ contains_implemented_extensions_other_than()

◆ contains_other_than()

◆ deserialize()

◆ empty()

◆ extension_types()

◆ get() [1/2]

◆ get() [2/2]

◆ has() [1/2]

◆ has() [2/2]

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ remove_extension()

◆ serialize()

◆ size()

◆ take() [1/2]

◆ take() [2/2]